package top.cardone.data.support.impl;

import org.apache.commons.collections.MapUtils;
import org.apache.commons.lang3.ArrayUtils;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.util.StringUtils;
import top.cardone.data.support.PageableSupport;

import java.util.Map;

/**
 * Created by yao hai tao on 2015/8/9.
 */
public class PageableSupportImpl implements PageableSupport {
	/**
	 * 排序集合
	 */
	@lombok.Setter
	private String directionParam = "direction";

	/**
	 * 页面代码参数名
	 */
	@lombok.Setter
	private String pageParam = "pageNumber";

	/**
	 * 属性集合
	 */
	@lombok.Setter
	private String propertiesParam = "properties";

	/**
	 * 分页行数大小
	 */
	@lombok.Setter
	private int size = 10;

	/**
	 * 分页行数大小参数名
	 */
	@lombok.Setter
	private String sizeParam = "pageSize";

	@Override
	public Pageable newPageable(Map<String, ?> paramMap) {
		int page = Math.max(MapUtils.getIntValue(paramMap, this.pageParam, 1), 1) - 1;

		int size = MapUtils.getIntValue(paramMap, this.sizeParam, this.size);

		String propertiesString = MapUtils.getString(paramMap, this.propertiesParam);

		if (StringUtils.isEmpty(propertiesString)) {
			return new PageRequest(page, size);
		}

		String[] properties = propertiesString.split(",");

		if (ArrayUtils.isEmpty(properties)) {
			return new PageRequest(page, size);
		}

		String directionString = MapUtils.getString(paramMap, this.directionParam);

		Sort.Direction directio = Sort.Direction.fromStringOrNull(directionString);

		if (directio == null) {
			directio = Sort.Direction.DESC;
		}

		return new PageRequest(page, size, directio, properties);
	}
}
